Backlight module brightness calibration method, display device thereof, and brightness calibration device thereof

Abstract

The present application discloses a backlight module brightness calibration method. The method includes: a brightness detection step, a grayscale sorting step, a grayscale calibration table generation step, and a grayscale calibration table output step. The present application re-sorts first grayscale values of a grayscale range of backlight divisions of a display device according to actual brightness values to obtain a grayscale calibration table to further mitigate or avoid a technical issue of a discontinuous or jump-varying grayscale transition of a backlight module of a conventional display device.

What is claimed is: 
     
         1 . A backlight module brightness calibration method for a display device, comprising:
 a brightness detection step comprising detecting a plurality of actual brightness values of a plurality of first grayscale values of at least one of backlight divisions of a backlight module of the display device, wherein each of the first gray values is detected from one of light emitting elements of one of the backlight divisions;   a grayscale sorting step comprising re-sorting the first grayscale values according to a brightness value sequence of the actual brightness values;   a grayscale calibration table generation step comprising establishing a grayscale calibration table corresponding to the backlight division according to the first grayscale values re-sorted, wherein the grayscale calibration table comprises a plurality of second grayscale values, the second grayscale values are mapped to the first grayscale values re-sorted, and the re-sorting results in the actual brightness value corresponding to any smaller one of the second grayscale values is less than the actual brightness value corresponding to any greater one of the second grayscale values; and   a grayscale calibration table output step comprising outputting the grayscale calibration table.   
     
     
         2 . The backlight module brightness calibration method for a display device according to  claim 1 , wherein
 the brightness detection step further comprises: detecting the actual brightness values of the first grayscale values in a grayscale range corresponding to each of the backlight divisions of the backlight module of the display;   the grayscale calibration table generation step further comprises: establishing grayscale calibration tables corresponding to the backlight divisions according to the first grayscale values re-sorted in each of the backlight divisions, wherein each of the grayscale calibration tables comprises the second grayscale values, the second grayscale values are mapped to the first grayscale values re-sorted, and the actual brightness value corresponding to any smaller one of the second grayscale values is less than the actual brightness value corresponding to any greater one of the second grayscale values; and   the grayscale calibration table output step further comprises: connecting a brightness control unit of the backlight module through a transmission line to output and store the grayscale calibration tables into the brightness control unit.   
     
     
         3 . The backlight module brightness calibration method for a display device according to  claim 2 , wherein after the grayscale calibration table generation step, the method further comprises a division grayscale alignment step comprising fine-adjusting a brightness value of one of the light emitting elements of each of the backlight divisions such that the actual brightness values corresponding to the same second grayscale value in the grayscale calibration tables are equal. 
     
     
         4 . The backlight module brightness calibration method for a display device according to  claim 1 , wherein in the grayscale sorting step, the brightness value sequence is a sequence of the actual brightness values in an increasing arrangement or a decreasing arrangement. 
     
     
         5 . The backlight module brightness calibration method for a display device according to  claim 1 , wherein
 each of the backlight divisions comprises a light emitting element, the light emitting element is configured to output the actual brightness values according to the first grayscale values in a grayscale range corresponding to each of the backlight divisions of the backlight module of the display; and   the brightness control unit is configured to control each of the backlight divisions to perform divisional light adjustment.   
     
     
         6 . The backlight module brightness calibration method for a display device according to  claim 1 , wherein
 the brightness detection step further comprises: detecting the actual brightness values of the first grayscale values in a grayscale range corresponding to each of the backlight divisions of the backlight module of the display device;   the grayscale calibration table generation step further comprises: establishing grayscale calibration tables corresponding to the backlight divisions according to the first grayscale values re-sorted in each of the backlight divisions, wherein each of the grayscale calibration tables comprises the second grayscale values, the second grayscale values are mapped to the first grayscale values re-sorted, and the actual brightness value corresponding to any smaller one of the second grayscale values is less than the actual brightness value corresponding to any greater one of the second grayscale values;   the grayscale calibration table output step further comprises: connecting a brightness control unit of the backlight module through a transmission line to output and store the grayscale calibration tables into the brightness control unit;   after the grayscale calibration table generation step, the method further comprises a division grayscale alignment step comprising fine-adjusting a brightness value of a light emitting element of each of the backlight divisions such that the actual brightness values corresponding to the same second grayscale value in the grayscale calibration tables are equal;   in the grayscale sorting step, the brightness value sequence is a sequence of the actual brightness values in an increasing arrangement or a decreasing arrangement;   each of the backlight divisions comprises a light emitting element, the light emitting element is configured to output the actual brightness values according to the first grayscale values in the grayscale range; and   the brightness control unit is configured to control each of the backlight divisions to perform divisional light adjustment.   
     
     
         7 . A display device, comprising:
 a backlight module, wherein the backlight module is divided into a plurality of backlight divisions, and the backlight module comprises a brightness control unit configured to control each of the backlight divisions to perform divisional light adjustment; and   a display panel disposed on the backlight module, wherein the brightness control unit comprises a grayscale driving reference table and a grayscale calibration table, the grayscale driving reference table comprise a plurality of first grayscale values of at least one of the backlight divisions and a driving value corresponding each of the first grayscale values, each of the first gray values is detected from one of light emitting elements of one of the backlight divisions, the grayscale calibration table comprises a plurality of second grayscale values, each of the second grayscale values is mapped to one of the first grayscale values of the grayscale driving reference table, and   the first gray scale values of the grayscale driving reference table are re-sorted according to a brightness value sequence of actual brightness values, such that the actual brightness value of the backlight division corresponding to any smaller one of the second grayscale values is less than the actual brightness value of the backlight division of any greater one of the second grayscale values.   
     
     
         8 . The display device according to  claim 7 , wherein the brightness control unit comprises a plurality of grayscale driving reference tables, and each of the grayscale driving reference tables corresponds to one of the backlight divisions. 
     
     
         9 . The display device according to  claim 7 , wherein each of the backlight divisions comprises one of the light emitting elements of each of the backlight divisions, the light emitting element is configured to output the actual brightness values according to the first grayscale values in a grayscale range corresponding to each of the backlight divisions of the backlight module of the display. 
     
     
         10 . The display device according to  claim 7 , wherein
 the brightness control unit comprises a plurality of grayscale driving reference tables, and each of the grayscale driving reference tables corresponds to one of the backlight divisions; and   each of the backlight divisions comprises a light emitting element, and the light emitting element is configured to output the actual brightness values according to the first grayscale values in a grayscale range corresponding to each of the backlight divisions of the backlight module of the display.   
     
     
         11 . A backlight module brightness calibration device for a display device, comprising:
 a brightness detection module configured to detect a plurality of actual brightness values of a plurality of first grayscale values of at least one of backlight divisions of a backlight module of the display device, wherein each of the first gray values is detected from one of light emitting elements of one of the backlight divisions;   a grayscale sorting module configured to re-sort the first grayscale values according to brightness value sequence of the actual brightness values;   a grayscale calibration table generation module configured to establish a grayscale calibration table corresponding to the backlight division according to the first grayscale values re-sorted, wherein the grayscale calibration table comprises a plurality of second grayscale values, the second grayscale values are mapped to the first grayscale values re-sorted, and the re-sorting results in the actual brightness value corresponding to any smaller one of the second grayscale values is less than the actual brightness value corresponding to any greater one of the second grayscale values; and   a grayscale calibration table output module configured to output the grayscale calibration table.   
     
     
         12 . The backlight module brightness calibration device for a display device according to  claim 11 , wherein
 the brightness detection module is further configured to: detecting the actual brightness values of the first grayscale values in a grayscale range corresponding to each of the backlight divisions of the backlight module of the display device;   the grayscale calibration table generation module is further configured to establish grayscale calibration tables corresponding to the backlight divisions according to the first grayscale values re-sorted in each of the backlight divisions, wherein each of the grayscale calibration table comprises a plurality of second grayscale values, the second grayscale values are mapped to the first grayscale values re-sorted, and the actual brightness value corresponding to any smaller one of the second grayscale values is less than the actual brightness value corresponding to any greater one of the second grayscale values; and   the grayscale calibration table output module is further configured to connect a brightness control unit of the backlight module through a transmission line to output and store the grayscale calibration tables into the brightness control unit.